<script setup>
import { userRegisterService, userLoginService } from '@/api/user.js'

// 引入icon图标
import { User, Lock } from '@element-plus/icons-vue'
import { ref, watch } from 'vue'
import { useUserStore } from '@/stores'
import { useRouter } from 'vue-router'

const isRegister = ref(false)

const form = ref()
// 用于提交的form数据对象
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})
// 表单校验规则，通用：消息提示message，触发时机trigger（blur:失焦时 change:改变时）
// 1.非空校验required:true
// 2.长度校验min:xx,max:xx
// 3.正则校验pattern:正则表达式
// 4.自定义校验validator:自定义校验函数
// validator:(rule,value,callback)=>{}
// rule:校验规则对象
// value:校验的值
// callback:回调函数，校验通过调用callback()，校验不通过调用callback(new Error('校验失败'))
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    {
      pattern: /^[a-zA-Z0-9]{1,10}$/,
      message: '用户名必须是1-10位大小写字母和数字',
      trigger: 'blur'
    }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    { pattern: /^\S{6,15}$/, message: '密码必须是6-15位非空格字符', trigger: 'blur' }
  ],
  repassword: [
    { required: true, message: '请再次输入密码', trigger: 'blur' },
    { pattern: /^\S{6,15}$/, message: '密码必须是6-15位非空格字符', trigger: 'blur' },
    {
      validator: (rule, value, callback) => {
        if (value !== formModel.value.password) {
          callback(new Error('两次输入密码不一致'))
        } else {
          callback()
        }
      },
      trigger: 'blur'
    }
  ]
}
// 注册事件
const register = async () => {
  // 注册成功之前先进行表单校验，校验成功 => 请求，校验失败 => 自动提示
  await form.value.validate()
  await userRegisterService(formModel.value)
  // ElementPlus的消息提示
  ElMessage.success('注册成功')
  // 注册成功后，切换到登录表单
  isRegister.value = false
}
const userStore = useUserStore()
const router = useRouter()
// 登录事件
const login = async () => {
  // 登录成功之前先进行表单校验，校验成功 => 请求，校验失败 => 自动提示
  await form.value.validate()
  const res = await userLoginService(formModel.value)
  // pinia存储token
  userStore.setToken(res.data.token)
  // ElementPlus的消息提示
  ElMessage.success('登录成功')
  // 登录成功后，切换到布局架子
  router.push('/')
}

//切换注册登录时重置表单内容
watch(isRegister, () => {
  formModel.value = {
    username: '',
    password: '',
    repassword: ''
  }
})
</script>

<template>
  <!-- el-row表示一行，一行分成24份 -->
  <el-row class="login-page">
    <!-- el-col表示一列，span表示占用的份数，offset表示偏移的份数，即左margin -->
    <el-col
      :span="12"
      class="bg"
    ></el-col>
    <el-col
      :span="6"
      :offset="3"
      class="form"
    >
      <!-- el-form整个表单组件 -->
      <!-- 注册相关表单 -->
      <el-form
        :model="formModel"
        :rules="rules"
        ref="form"
        size="large"
        autocomplete="off"
        v-if="isRegister"
      >
        <!-- el-form-item表示表单中的一项 -->
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="formModel.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
            v-model="formModel.repassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请再次输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="register"
            class="button"
            type="primary"
            auto-insert-space
          >
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link
            type="info"
            :underline="false"
            @click="isRegister = false"
          > ← 返回 </el-link>
        </el-form-item>
      </el-form>
      <!-- 登录相关表单 -->
      <el-form
        :model="formModel"
        :rules="rules"
        ref="form"
        size="large"
        autocomplete="off"
        v-else
      >
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="formModel.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link
              type="primary"
              :underline="false"
            >忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="login"
            class="button"
            type="primary"
            auto-insert-space
          >登录</el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link
            type="info"
            :underline="false"
            @click="isRegister = true"
          > 注册 → </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;

  .bg {
    background:
      // url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }

  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;

    // title好像没用到
    .title {
      margin: 0 auto;
    }

    .button {
      width: 100%;
    }

    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>
